What are gout and pseudogout?

Updated: Jan 26, 2021
  • Author: Bruce M Rothschild, MD; Chief Editor: Herbert S Diamond, MD  more...
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Gout and pseudogout are the two most common crystal-induced arthropathies. Gout is caused by monosodium urate monohydrate crystals; pseudogout is caused by calcium pyrophosphate (CPP) crystals and is more accurately termed calcium pyrophosphate disease (CPPD). (See Pathophysiology and Etiology.) Gout is one of the oldest diseases in the medical literature, known since the time of the ancient Greeks. [1] Pseudogout, which may be clinically indistinguishable from gout, was recognized as a distinct disease entity in 1962.

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